Ahmed Robulla Sakti, & Jerry Heikal. (2026). Integrasi RFM dan Etnografi dalam Segmentasi Buyer B2B PT Kaltim Prima Coal: Identifikasi Churn Risk dan Pengembangan Online Value Proposition. ARMADA : Jurnal Penelitian Multidisiplin, 4(8), 4239–4250. https://doi.org/10.55681/armada.v4i8.3515